I am looking at mouser as the first choice but thought I would ask here first. You never know people might have some spare etc and have a different reputable source they use.
Old Lumens god bless him, used one and bought his from China. When I tried the link he posted up they are no longer trading. Plus I found a few bad reviews on the company.

I’d like to see someone take a high powered large die LED and use multiple lenses to concentrate and collimate the image to make a thin beam with thousands of lumens!

To make it REALLY over-the-top cool, use a Wavien Collar to recycle stray rays and get even better performance!

These large die LEDs make a lot of lumens, but the surface brightness is just not very high, so they are not good if the application requires a lot of throw. For example, the LED in the OP might put out 15,000 lumens and is (30mm*30mm*pi/4)=706mm^2 in area, so 21 lumens/mm^2. An XPL HI would do 1,500 lumens in 4mm^2, or 375 lumens/mm^2.

The engineering would be a lot simpler for the large LED, though. Mounting 1 big lens vs 10 smaller ones.

I’d like to see someone take a high powered large die LED and use multiple lenses to concentrate and collimate the image to make a thin beam with thousands of lumens!

To make it REALLY over-the-top cool, use a Wavien Collar to recycle stray rays and get even better performance!

These large die LEDs make a lot of lumens, but the surface brightness is just not very high, so they are not good if the application requires a lot of throw. For example, the LED in the OP might put out 15,000 lumens and is (30mm*30mm*pi/4)=706mm^2 in area, so 21 lumens/mm^2. An XPL HI would do 1,500 lumens in 4mm^2, or 375 lumens/mm^2.

The engineering would be a lot simpler for the large LED, though. Mounting 1 big lens vs 10 smaller ones.

With multiple lenses, the image can be concentrated down, then collimated at the smaller size. NOT possible with a single lens!

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Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone.
-Ayn Rand